Classification
000 - Computer science, information & general works
700 - The arts; fine & decorative arts
78
600 - Technology
66
333 - Economics of land & energy
54
330 - Economics
44
900 - History & geography
42
620 - Engineering & allied operations
40
363 - Other social problems & services
37
380 - Commerce, communications & transportation
30
500 - Natural sciences & mathematics
29
576 - Genetics & evolution
29
610 - Medicine & health
20
551 - Geology, hydrology & meteorology
19
140 - Specific philosophical schools
17
320 - Political science
16
658 - General management
15
530 - Physics
10
630 - Agriculture & related technologies
9
400 - Language
7
580 - Plants (Botany)
7
720 - Architecture
7
340 - Law
6
581 - Specific topics in natural history
6
370 - Education
5
410 - Linguistics
5
414 - Phonology & phonetics
4
100 - Philosophy & psychology
3
304 - Factors affecting social behavior
3
540 - Chemistry & allied sciences
3
361 - Social problems & social welfare in general
2
650 - Management & auxiliary services
2
770 - Photography, photographs & computer art
2
800 - Literature & rhetoric
2
170 - Ethics
1
200 - Religion
1
297 - Islam, Babism & Bahai Faith
1
300 - Social sciences
1
519 - Probabilities & applied mathematics
1
550 - Earth sciences
1
612 - Human physiology
1
657 - Accounting
1
780 - Music
1